Ditch the foil. Have you heard that enough times yet? The stuff you are talking about is "mylar". You can buy it at Walmart and other sporting goods stores. It is sold as "emergency blankets". Very inexpensive. If you can't find mylar, white paint works good too.

If you get an HID, get a digital ballast and then you can use either bulb - mh/hps - with the same ballast.

PC :smokin: